McGregor uses son in profane tweet to Mayweather

If you thought Conor McGregor and Floyd Mayweather going back and forth on Twitter was something we were leaving behind in 2017, think again.

McGregor uses son in profane tweet to Mayweather

The two combat stars were back at it once again on Wednesday (AEDT).

Mayweather started by posting a cryptic video that showed him climbing into a cage at a Las Vegas gym, no doubt to tease the people who are interested in the rumours the 41-year-old boxer could try his hand at MMA this year.

Mayweather has dismissed those notions, but Wednesday's (AEDT) video combined with two of McGregor’s responses will no doubt stoke the fire at least a little while longer.

McGregor’s first response was a bemused but polite one, the type of message that two pals who cashed huge checks for their megafight last August might send back and forth.